-did you try a new d/l and install of 6.14?
-did you double check to be sure that the ports you want are correct in new version of mIRC?
-are you using any scripts/addons that might not be compatible with later versions of mIRC?
If 6.14 works for some people, good luck to them. For me, 6.14 just doesn't work. I had exactly the same problem with 6.12 when it first came out and supposedly sorted the security issues with earlier versions. 6.03 does work. End of story, far as I'm concerned.